If you don't have issues with
www.xgclan.com but you do with the forum then it might be caused by HTTPS.
Modern browsers and OS have support for SNI which is required.
Minimum requirements:
Desktop Browsers
Internet Explorer 7 and later
Firefox 2
Opera 8 with TLS 1.1 enabled
Google Chrome:
Supported on Vista and later by default
OS X 10.5.7 in Chrome Version 5.0.342.0 and later
Safari 2.1 and later (requires OS X 10.5.6 and later or Windows Vista and later)
Mobile Browsers
Mobile Safari for iOS 4.0
Android 3.0 (Honeycomb) and later
Windows Phone 7
Windows XP SP2 and Android <3.0 are not supported either.
I didn't think anyone would still be using these, since they are really outdated and less than 1% of the global internet users still has this. I guess some people never install updates...